https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111494
Bug ID: 111494 Summary: Signed overflow introduced by vectorizer Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimization Assignee: unassigned at gcc dot gnu.org Reporter: kristerw at gcc dot gnu.org Target Milestone: --- The vectorizer changes the order of additions when vectorizing the loop below, but it is not changing the arithmetic to be unsigned, so it introduces new signed overflows that were not in the original program. int a[32]; int foo(int n) { int sum = 0; for (int i = 0; i < n; i++) sum += a[i]; return sum; }